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Degarelix (Firmagon)

Find out what degarelix is, how you have it and other important information about having degarelix.

Degarelix is a hormone therapy drug and is also known by its brand name Firmagon.

Degarelix is a treatment for advanced hormone dependent prostate cancer. Hormone dependent means that that the cancer cells need a hormone in order to grow.

How degarelix works

Prostate cancer depends on testosterone to grow. Drugs that stop the testes making testosterone can slow or stop the growth of prostate cancer cells. 

Degarelix works by blocking gonadatrophin releasing hormone receptors in the pituitary gland in the brain. The pituitary gland then stops producing luteinising hormone. The lutenising hormone is then not available to trigger the testes to make testosterone. 

How you have degarelix

You have degarelix as an injection just under the skin (subcutaneously) into the fatty tissue of your tummy (abdomen). 

Tests during treatment

You might have blood tests before starting treatment and regularly during your treatment. The tests check your levels of blood cells and other substances in the blood. They also check how well your liver and kidneys are working.

Side effects

Important information

Other medicines, foods and drink

Cancer drugs can interact with some other medicines and herbal products. Tell your doctor or pharmacist about any medicines you are taking. This includes vitamins, herbal supplements and over the counter remedies.


This treatment might stop you being able to father a child.

Talk to your doctor before starting treatment if you think you may want to have a baby in the future. You may be able to store sperm before starting treatment.

More information about this treatment

For further information about this treatment go to the electronic Medicines Compendium (eMC) website.

You can report any side effect you have to the Medicines Health and Regulatory Authority (MHRA) as part of their Yellow Card Scheme.

Information and help

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About Cancer generously supported by Dangoor Education since 2010.